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Journal of Biological Sciences
Year: 2003  |  Volume: 3  |  Issue: 7  |  Page No.: 674 - 680

Line x Tester Analysis in True Seed of Potato (Solanum tuberosum SPP tuberosum)

Muhammad Zaffar Iqbal and Sultan Ahmad Khan    

Abstract: Line X tester analysis, involving five lines and three testers were made in potato for five parameters. The variances due to GCA and SCA showed that the gene action was predominantly additive for stem height and stem plant-1 whereas preponderance of non-additive genetic effect was advocated for dry matter content percentage and specific gravity. Both additive and non-additive generic interaction was important for yield of potatoes. The line Diamant was best general combiner for the characters like stem plant-1 and yield of potatoes ha-1 whereas line Bartina was the best general combiner for main stem height and specific gravity. However Desiree proved to be the best general combiner as far as dry matter content is concerned. The tester Cardinal proved the best general combiner for all the characters under study. The specific combining ability effects were the highest in the cross Hydra X Cardinal for stem height. Whereas, for stems plant-1 and dry matter content percentage, the cross Bartina X Cardinal surpassed rest of the crosses. The cross Diamant X Kondor manifested the excellent specific combining ability value for yield of potato ha-1. The best general combining ability parent when utilized in cross combinations as one of the parents produced good combinations in main stem height, number of stem Plant-1, dry matter content and yield of potatoes ha-1. This suggests additive X additive or additive X dominance gene interaction for these traits. The cross Hydra and Multa gave the best SCA effect for specific gravity having both the parents with low GCA effect hence suggested non-additive i.e., dominance and epastatic type of gene action for this character. Recurrent selection with progeny testing is contemplated for improving the tuber yield in potato.

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